On-Orbit Characterization of the TIMED Global UltraViolet Imager (GUVI)

Details On-Orbit Characterization of the TIMED Global UltraViolet Imager (GUVI) On-Orbit Characterization of the TIMED Global UltraViolet Imager (GUVI)

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa52a..10w&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SA52A-10

Physics

Optics

2494 Instruments And Techniques, 0310 Airglow And Aurora, 0358 Thermosphere: Energy Deposition, 0394 Instruments And Techniques

Scientific paper

We present various aspects of the calibration techniques and on-orbit performance of the Global UltraViolet Imager (GUVI), currently operating aboard the TIMED spacecraft. On-orbit characterization of the instrument is discussed, particularly in reference to the quality of the data provided to the user community. GUVI's science objectives require a radiometric accuracy of ~8% in the far UV for the duration of the mission. This goal is achieved through a combination of extensive pre-flight ground calibration measurements in the APL Optical Calibration Facility (OCF) and ongoing analysis of in-flight data; there is no onboard calibration lamp. Calibration procedures must address the performance of both the detectors and the instrument optics, including reflectivity of the scan mirror assembly that provides GUVI's large 140o field of regard. Absolute radiometric accuracies are updated by calibration with stellar sources; detector flat-fielding and pixel-to-pixel variations in responsivity are checked against an ensemble average of images of the sunlit terrestrial disk, in addition to the stellar calibration results. The unique capabilities of the TIMED spacecraft are demonstrated in the performance of a ``roll maneuver'', designed to provide precise measurement of the alignment of GUVI's imaging slits. Further discussions of GUVI's science objectives and GUVI data validation are provided by Christensen et al. and Paxton et al. (this session).

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